If you get stuck you could try contacting whoever the carrier is. I did that with a phone I found on Dale Head a few years ago. It had been locked by the time I found it so waiting for someone to call and then answering wasn't an option. It had an EE sim so I called them, gave them the IMEI and they sent me a freepost padded box to return it to them, where they presumably passed it back to its rightful owner.
Depending on which iphone, if it is still is on and connected to network, has Siri activated, etc., you can use Siri to call or text “home”, “mum/dad” or one of the missed calls, etc., which may help find the owner. Worth a try?
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